Bump ismp-testsuite from 711fd0c to 5c869cf

Bumps [ismp-testsuite](https://github.com/polytope-labs/hyperbridge) from `711fd0c` to `5c869cf`.
- [Release notes](https://github.com/polytope-labs/hyperbridge/releases)
- [Commits](polytope-labs/hyperbridge@711fd0c...5c869cf)

---
updated-dependencies:
- dependency-name: ismp-testsuite
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>